Workshop for Flipped Class
Based on students having completed the Chapter 1 e-Lesson before class
Chapter 1
Introduction to Process Control
Copyright © Thomas Marlin 2016
CHAPTER 1. INTRODUCTION TO PROCESS CONTROL
Workshop 1. Manual Flow Control
The person is implementing flow control “manually”
a.
Explain the principle for a typical flow sensor, the orifice meter.
b.
Explain how the final element affects the controlled flow.
c.
Explain how this system can be
used to control flow rate, or if
control is not possible, propose
modifications that will make
control possible.
d.
Flow
sensor
Is the person implementing
FEEDBACK control?
Constant speed
electrical motor
M
Centrifugal
pump
valve
CHAPTER 1. INTRODUCTION TO PROCESS CONTROL
Workshop 2. Manual Level Control
The person is implementing level control “manually”
a.
Explain the principle for a typical level sensor
b.
Explain how the final element affects the adjusted flow.
c.
Explain how this system can be
used to control level, or if
control is not possible, propose
modifications that will make
control possible.
d.
Is the person implementing
FEEDBACK control?
sensor
valve
M
Constant speed
electrical motor
Centrifugal
pump
CHAPTER 1. INTRODUCTION TO PROCESS CONTROL
Workshop 5. Why is boiler control needed?
For the boiler process in the figure, identify at least one example of
1.
2.
3.
Model mismatch
Disturbance
Change to desired
variable value
Flue gas
Boiler feed water
air
Superheated
steam
Saturated
steam
Fuel gas
CHAPTER 1. INTRODUCTION TO PROCESS CONTROL
Workshop 6. Applying the feedback principle
A non-isothermal, stirred tank CSTR is shown in the figure below. Decide
whether each of the following approaches applies the feedback principle.
1.
2.
3.
Control A1 by adjusting the opening of valve v2
Control A1 by adjusting the opening of valve v1
Control A1 by compensating for changes in measured A2 by adjusting
the opening of valve v2
A2
Feed contains only
solvent and “A”
A®B
CAin
v1
A1
CA
Heating medium
v2